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Lipoxygenase

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https://www.readbyqxmd.com/read/28633105/effects-of-triacontanol-on-ascorbate-glutathione-cycle-in-brassica-napus-l-exposed-to-cadmium-induced-oxidative-stress
#1
Elham Asadi Karam, Viviana Maresca, Sergio Sorbo, Batool Keramat, Adriana Basile
The ability of exogenous triacontanol (TRIA), a plant growth regulator, to reduce Cd toxicity was studied in canola (Brassica napus L.) plants. The following biological parameters were examined in canola seedlings to investigate TRIA-induced tolerance to Cd toxicity: seedling growth, chlorophyll damage and antioxidant response. In particular, TRIA application reduced Cd-induced oxidative damage, as shown by reduction of ROS content, lipoxygenase (LOX) activity and lipid peroxidation level. TRIA pretreatment increased non-enzymatic antioxidant contents (ascorbate, AsA, glutathione and GSH), phytochelatin content (PCs) and activities of antioxidant enzymes such as superoxide dismutase (SOD), catalase (CAT), ascorbate peroxidase (APX), guaiacol peroxidase (GPX), monodehydroascorbate reductase (MDHAR), dehydro ascorbate reductase (DHAR), and glutathione reductase (GR), so reducing the oxidative stress...
June 17, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28630621/development-of-snp-genotyping-assays-for-seed-composition-traits-in-soybean
#2
Gunvant Patil, Juhi Chaudhary, Tri D Vuong, Brian Jenkins, Dan Qiu, Suhas Kadam, Grover J Shannon, Henry T Nguyen
Seed composition is one of the most important determinants of the economic values in soybean. The quality and quantity of different seed components, such as oil, protein, and carbohydrates, are crucial ingredients in food, feed, and numerous industrial products. Soybean researchers have successfully developed and utilized a diverse set of molecular markers for seed trait improvement in soybean breeding programs. It is imperative to design and develop molecular assays that are accurate, robust, high-throughput, cost-effective, and available on a common genotyping platform...
2017: International Journal of Plant Genomics
https://www.readbyqxmd.com/read/28628313/tunneling-kinetics-and-non-adiabatic-proton-coupled-electron-transfer-in-proteins-the-effect-of-electric-fields-and-anharmonic-donor-acceptor-interactions
#3
Bridget Salna, Abdelkrim Benabbas, Douglas Russo, Paul M Champion
A proper description of proton donor-acceptor (D-A) distance fluctuations is crucial for understanding tunneling in proton-coupled electron transport (PCET). The typical harmonic approximation for the D-A potential results in a Gaussian probability distribution, which does not appropriately reflect the electronic repulsion forces that increase the energetic cost of sampling shorter D-A distances. Because these shorter distances are the primary channel for thermally activated tunneling, the analysis of tunneling kinetics depends sensitively on the inherently anharmonic nature of the D-A interaction...
June 19, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28625237/-study-on-mechanisms-and-myocardial-protective-effect-of-qishen-yiqi-dropping-pills-on-rats-with-myocardial-infarction
#4
Quan Yang, Yunshan Cao
OBJECTIVE: To approach the mechanisms and myocardial protective effect of Qishen Yiqi dropping pills on rats with myocardial infarction. METHODS: Sixty clean healthy male Sprague-Dawley (SD) rats were randomly divided into sham operation group, model group and observation group (each n = 20). The rat model of acute myocardial infarction (AMI) was established by ligation of left anterior descent (LAD) branch of coronary artery. After modeling, the rats in observation group were given 0...
June 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28623868/ozone-induced-foliar-damage-and-release-of-stress-volatiles-is-highly-dependent-on-stomatal-openness-and-priming-by-low-level-ozone-exposure-in-phaseolus-vulgaris
#5
Shuai Li, Peter C Harley, Ülo Niinemets
Acute ozone exposure triggers major emissions of volatile organic compounds (VOC), but quantitatively, it is unclear how different ozone doses alter the start and the total amount of these emissions, and the induction rate of different stress volatiles. It is also unclear whether priming (i.e., pre-exposure to lower O3 concentrations) can modify the magnitude and kinetics of volatile emissions. We investigated photosynthetic characteristics and VOC emissions in Phaseolus vulgaris following acute ozone exposure (600 nmol mol(-1) for 30 min) under illumination and in darkness and after priming with 200 nmol mol(-1) O3 for 30 min...
June 17, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28623130/leukotriene-signaling-via-alox5-and-cysteinyl-leukotriene-receptor-1-is-dispensable-for-in%C3%A2-vitro-growth-of-cd34-cd38-stem-and-progenitor-cells-in-chronic-myeloid-leukemia
#6
Monika Dolinska, Alexandre Piccini, Wan Man Wong, Eleni Gelali, Anne-Sofie Johansson, Johannis Klang, Pingnan Xiao, Elham Yektaei-Karin, Ulla Olsson Strömberg, Satu Mustjoki, Leif Stenke, Marja Ekblom, Hong Qian
Tyrosine kinase inhibitors targeting the BCR-ABL oncoprotein in chronic myeloid leukemia (CML) are remarkably effective inducing deep molecular remission in most patients. However, they are less effective to eradicate the leukemic stem cells (LSC), resulting in disease persistence. Therefore, there is great need to develop novel therapeutic strategies to specifically target the LSC. In an experimental mouse CML model system, the leukotriene pathway, and specifically, the expression ALOX5, encoding 5-lipoxygenase (5-LO), has been reported as a critical regulator of the LSC...
June 13, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28620607/metabolic-and-biochemical-stressors-in-diabetic-cardiomyopathy
#7
REVIEW
Vasundhara Kain, Ganesh V Halade
Diabetic cardiomyopathy (DCM) or diabetes-induced cardiac dysfunction is a direct consequence of uncontrolled metabolic syndrome and is widespread in US population and worldwide. Despite of the heterogeneous and distinct features of DCM, the clinical relevance of DCM is now becoming established. DCM progresses to pathological cardiac remodeling with the higher risk of heart attack and subsequent heart failure in diabetic patients. In this review, we emphasize lipid substrate quality and the phenotypic, metabolic, and biochemical stressors of DCM in the rodent and human pathophysiology...
2017: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28611577/the-anti-inflammatory-effects-of-lipoxygenase-and-cyclo-oxygenase-inhibitors-in-inflammation-induced-human-fetal-glia-cells-and-the-a%C3%AE-degradation-capacity-of-human-fetal-astrocytes-in-an-ex-vivo-assay
#8
Rea Pihlaja, Merja Haaparanta-Solin, Juha O Rinne
Chronic inflammation is a common phenomenon present in the background of multiple neurodegenerative diseases, including Alzheimer's disease (AD). The arachidonic acid pathway overproduces proinflammatory eicosanoids during these states and glial cells in the brain gradually lose their vital functions of protecting and supporting neurons. In this study, the role of different key enzymes of the eicosanoid pathway mediating inflammatory responses was examined in vitro and ex vivo using human fetal glial cells...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28609824/12-lipoxygenase-inhibitor-improves-functions-of-cytokine-treated-human-islets-and-type-2-diabetic-islets
#9
Kaiwen Ma, So Hyun Park, Glenn Lindsey, Jackson Laura, Barot Tatvam, Jessica R Weaver, David A Taylor-Fishwick, Diane K Luci, David J Maloney, Raghavendra G Mirmira, Yumi Imai, Jerry L Nadler
Context: 12-lipoxygenase (12-LO) pathway produces pro-inflammatory metabolites and its activation is implicated in islet inflammation associated with type 1 and type 2 diabetes (T1D, T2D). Objectives: We aimed to test the efficacy of ML355, a new highly selective small molecule inhibitor of 12-LO, for the preservation of islet function. Design: Human islets from non-diabetic donors were incubated with the mixture of TNFα, interluekin-1β, and interferon-γ to model islet inflammation...
May 10, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28603120/enzyme-inhibitory-antifungal-antibacterial-and-hemolytic-potential-of-various-fractions-of-colebrookia-oppositifolia
#10
Tauheeda Riaz, Muhammad Athar Abbasi, Azizur Rehman, Sabahat Zahra Siddiqui, Muhammad Shahid, Hina Fatima, Muhammad Ashraf, Syeda Abida Ejaz, Zahid Ghulam Rasool, Ghulam Hasan Abbasi
The purpose of the present investigation was to assess the enzyme inhibition, antifungal, antibacterial and hemolytic activities of various fractions of Colebrookia oppositifolia Smith. The MeOH extract of plant was dissolved in dist. water and partitioned with n-hexane, CHCl3, EtOAc and n-BuOH sequentially. Enzyme inhibition studies were done against four enzymes i.e. α-glucosidase, butyrylcholinesterase, acetyl cholinesterase and lipoxygenase. Ethyl acetate fraction possessed very good activity against α-glucosidase (IC50 57...
January 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28602942/the-novel-lipid-mediator-pd1n-3-dpa-an-overview-of-the-structural-elucidation-synthesis-biosynthesis-and-bioactions
#11
REVIEW
Trond Vidar Hansen, Jesmond Dalli, Charles N Serhan
Resolvins, protectins and maresins are individual families of specialized pro-resolving mediators biosynthesized from the dietary n-3 polyunsaturated fatty acids eicosapentaenoic acid and docosahexaenoic acid. These enzymatically oxygenated polyunsaturated lipid mediators were first elucidated during the resolution phase of acute inflammation in animal models of self-limited inflammation. Specialized pro-resolving mediators display potent bioactions when administrated in vivo. Biosynthetic pathway studies have revealed that individual lipoxygenases and cyclooxygenase-2 converts eicosapentaenoic acid and docosahexaenoic acid into distinct families of the resolvins, protectins and maresins...
June 7, 2017: Prostaglandins & Other Lipid Mediators
https://www.readbyqxmd.com/read/28600709/cysteinyl-leukotriene-receptor-antagonists-inhibit-migration-invasion-and-expression-of-mmp-2-9-in-human-glioblastoma
#12
Pannaree Piromkraipak, Kant Sangpairoj, Wuttipong Tirakotai, Kulathida Chaithirayanon, Supeenun Unchern, Porntip Supavilai, Christopher Power, Pornpun Vivithanaporn
Glioblastoma is one of the most malignant and aggressive types of brain tumors. 5-lipoxygenase and cysteinyl leukotriene receptor 1 (CysLT1) play a role in human carcinogenesis. Leukotriene receptor antagonists (LTRAs), anti-asthmatic drugs with mild side effects, have anti-metastatic activity in epidermoid carcinoma, lung carcinoma, and colon cancers as well as neuroprotective effects. Herein, anti-migratory effects of two LTRAs, montelukast and zafirlukast, were investigated in glioblastoma cells. The level of CysLT1 in A172 cells was increased by 3...
June 9, 2017: Cellular and Molecular Neurobiology
https://www.readbyqxmd.com/read/28595877/lipoxygenase-inhibitors-protect-acute-lymphoblastic-leukemia-cells-from-ferroptotic-cell-death
#13
Lukas Probst, Jasmin Dächert, Barbara Schenk, Simone Fulda
Ferroptosis has recently been identified as a mode of programmed cell death. However, little is yet known about the signaling mechanisms. Here, we report that lipoxygenases (LOX) contribute to the regulation of RSL3-induced ferroptosis in acute lymphoblastic leukemia (ALL) cells. We show that the glutathione (GSH) peroxidase 4 (GPX4) inhibitor RSL3 triggers lipid peroxidation, production of reactive oxygen species (ROS) and cell death in ALL cells. All these events are impeded in the presence of Ferrostatin-1 (Fer-1), a small-molecule inhibitor of lipid peroxidation...
June 5, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28588394/the-two-row-malting-barley-cultivar-new-sachiho-golden-with-null-lipoxygenase-1-improves-flavor-stability-in-beer-and-was-developed-by-marker-assisted-selection
#14
Mika Oozeki, Toshinori Sotome, Naoto Haruyama, Masahiro Yamaguchi, Hirohisa Watanabe, Takeshi Okiyama, Tsuneo Kato, Toshiyuki Takayama, Makoto Oyama, Takashi Nagamine, Yasuo Suzuki, Takako Toyoshima, Takahiro Sekiwa, Kaori Oono, Tetsuya Saito, Masao Usui, Shin Arai, Terunobu Kumekawa, Emiko Suzuki, Kaori Shirama, Makoto Kihara, Takehiro Hoki, Hideki Matsubara, Ryo Ohsawa
Lipoxygenase-1 (LOX-1) null 'New Sachiho Golden' is a two-row malting barley (Hordeum vulgare L.) cultivar released in 2015 that was developed at the Tochigi Prefectural Agricultural Experimental Station by backcross breeding using the high-yield leading cultivar 'Sachiho Golden' as a recurrent parent and the LOX-1 null mutant 'Daikei LM1' as a non-recurrent parent. To develop 'New Sachiho Golden' we used a simple LOX activity assay and marker-assisted selection. This is the first LOX-1 null malting barley cultivar in Japan that is resistant to barley yellow mosaic virus (types I-III)...
March 2017: Breeding Science
https://www.readbyqxmd.com/read/28588366/neurocognitive-effect-of-nootropic-drug-brahmi-bacopa-monnieri-in-alzheimer-s-disease
#15
REVIEW
Kaustubh S Chaudhari, Nishant R Tiwari, Rakesh R Tiwari, Rohan S Sharma
Alzheimer's disease (AD) is a progressive neurodegenerative disease of the elderly. The rapid increase in its incidence has necessitated development of newer drugs. Ayurvedic herbal medications are increasingly researched due to their biosafety profile and usefulness in cognitive impairment. In this article, we critically reviewed one such Medhya Rasayana (nootropic drug) Brahmi-derived from extract of Bacopa monnieri (EBm). Studies have shown that EBm promotes free radical scavenger mechanisms and protects cells in prefrontal cortex, hippocampus, and striatum against cytotoxicity and DNA damage implicated in AD...
May 2017: Annals of Neurosciences
https://www.readbyqxmd.com/read/28588227/melon13-lipoxygenase-cmlox18-may-be-involved-in-c6-volatiles-biosynthesis-in-fruit
#16
Chong Zhang, Songxiao Cao, Yazhong Jin, Lijun Ju, Qiang Chen, Qiaojuan Xing, Hongyan Qi
To better understand the function role of the melon CmLOX18 gene in the biosynthesis of C6 volatiles during fruit ripening, we biochemically characterized CmLOX18 and identified its subcellular localization in transgenic tomato plants. Heterologous expression in yeast cells showed that the molecular weight of the CmLOX18 protein was identical to that predicted, and that this enzyme possesseed lipoxygenase activity. Linoleic acid was demonstrated to be the preferred substrate for the purified recombinant CmLOX18 protein, which exhibited optimal catalytic activity at pH 4...
June 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28579398/evaluation-of-the-expression-level-of-12-15-lipoxygenase-and-the-related-inflammatory-factors-ccl5-ccl3-in-respiratory-syncytial-virus-infection-in-mice-model
#17
Vahid Salimi, Ali Ramezani, Habibollah Mirzaei, Alireza Tahamtan, Ebrahim Faghihloo, Farhad Rezaei, Maryam Naseri, Louis Bont, Talat Mokhtari-Azad, Masoumeh Tavakoli-Yaraki
Human respiratory syncytial virus (RSV) is a leading cause of acute respiratory infection during early childhood and imposes a great burden on patients, parents, and society. Disease is thought to be caused, at least partially, by an excessive immune response. Pulmonary leukocyte infiltration is the result of a coordinated expression of diverse chemokines with distinct cellular specificities. Lipoxygenases (LOXs), as a key enzyme catalyzing deoxygenation of poly unsaturated fatty acids, regulate inflammation and have been suggested to play an important role in the immune response in viral infection...
June 1, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28572515/an-allene-oxide-and-12-oxophytodienoic-acid-are-key-intermediates-in-jasmonic-acid-biosynthesis-by-fusarium-oxysporum
#18
Ernst H Oliw, Mats Hamberg
Fungi can produce jasmonic acid (JA) and its isoleucine conjugate in large quantities, but little is known about the biosynthesis. Plants form JA from 18:3n-3 by 13S-lipoxygenase (13S-LOX), allene oxide synthase (AOS), and allene oxide cyclase (AOC). Shaking cultures of F. oxysporum f. sp. tulipae released over 200 mg jasmonates per liter. Nitrogen powder of the mycelia expressed 10R-dioxygenase-epoxy alcohol synthase activities, which was confirmed by comparison with the recombinant enzyme. 13S-LOX of F. oxysporum could not be detected in the cell-free preparations...
June 1, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28569991/the-role-of-5-lipoxygenase-in-aggregatibacter-actinomycetemcomitans-induced-alveolar-bone-loss
#19
Mila Fernandes Moreira Madeira, Celso Martins Queiroz Junior, Jôice Dias Corrêa, Sílvia Maria Cordeiro Werneck, Fabiana Simão Machado, Thiago Mattar Cunha, Gustavo Pompermaier Garlet, Mauro Martins Teixeira, Tarcília Aparecida da Silva, Daniele G Souza
AIM: Leukotrienes (LTs) are pro-inflammatory lipid mediators formed by the enzyme 5-lipoxygenase (5-LO). The involvement of 5-LO metabolites in periodontal disease (PD) is not well defined. This study aimed to assess the role of 5-LO in experimental PD induced by Aggregatibacter actinomycetemcomitans (Aa). MATERIAL AND METHODS: In vivo experiments were carried out using SV129 wild type (WT) and 5-LO deficient (5lo(-/-) ) mice inoculated with Aa. Osteoclasts were stimulated in vitro with AaLPS in the presence or not of selective inhibitors of the 5-LO pathway, or LTB4 or platelet-activating factor (PAF), since PAF has already been shown to increase osteoclast activity...
June 1, 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28569429/carborev-5901-the-first-carborane-based-inhibitor-of-the-5-lipoxygenase-pathway
#20
Robert Kuhnert, Menyhárt-Botond Sárosi, Sven George, Peter Lönnecke, Bettina Hofmann, Dieter Steinhilber, Blagoje Murganic, Sanja Mijatovic, Danijela Maksimovic-Ivanic, Evamarie Hey-Hawkins
The progression of cancer is accelerated by increased proliferation, angiogenesis, and inflammation. These processes are mediated by leukotrienes. Several cancer cell lines overexpress 5-lipoxygenase, an enzyme that converts arachidonic acid into leukotrienes. An early inhibitor of the 5-lipoxygenase pathway is Rev-5901, which, however, lacks in in vivo efficacy, as it is rapidly metabolized. We investigated the introduction of carboranes as highly hydrophobic and metabolically stable pharmacophores into lipoxygenase inhibitors...
June 1, 2017: ChemMedChem
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